There's nothing wrong with thinking that you're smart. You probably are pretty smart, and we commend your healthy esteem and belief in yourself. But healthy self-esteem has its limits. Those limits were pushed a couple years ago, when dating website OkCupid revealed how thousands of its users had answered one particular question in a survey to measure partner compatibility: Are you a genius?

Amazingly, according to OKCupid's blogger Christian Rudder, two in five people (and nearly half of all men!) said yes to that question. Rudder said, "2 out of 5 think they are one in a thousand." Now, as there's no single scientific definition of "genius," Rudder's "one in a thousand" is kind of arbitrary. But to qualify for most high IQ societies—"genius clubs" like MENSA—you usually need to have an IQ at least in the 98th to 99th percentile. That's about one in a hundred. So there's something seriously wrong when 50 percent of men think they are geniuses.